JPS6237561Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field The present invention relates to a cycle sewing machine.

BACKGROUND ART Conventionally, in cycle sewing machines such as button sewing machines and label sewing machines, there is a type in which a thread trimming mechanism is always activated and a presser foot is raised in response to stopping a sewing operation. However, in this type of cycle sewing machine, for example, when sewing a four-hole button or sewing a label using two stitch rows without a crossover thread, sewing from the first and second half of the cycle When forming two rows of stitches independently, the presser foot also rises at the same time when thread trimming is performed after forming the first row of stitches, which causes the work cloth to move and cut the threads of the second row of stitches. There was a risk that the sewing position of the sewing machine would shift.

Purpose The present invention was developed in view of the above circumstances, and its purpose is to sew two stitches in which the thread trimming mechanism and presser foot lifting mechanism are operated simultaneously and the positions of the final needles are far apart from each other. To provide a cycle sewing machine for forming stitch rows in which only thread cutting is performed and the presser foot is not lifted between the formation of a first stitch row and a second stitch row.

Solution In order to achieve the above object, in the cycle sewing machine of the present invention, at the end of the second half cycle, the presser foot lifting member and the engaging portion provided on the presser foot engage to raise the presser foot. Thus, a moving means is provided for moving the engaging portion within the movement trajectory of the presser foot lifting member.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a button sewing machine will be described with reference to the drawings.

A needle 12 is supported on the sewing machine frame 10 via a needle bar 11 so as to be able to reciprocate up and down, and the stitch forming means consisting of the needle 12 and a hook (not shown) that cooperates with the needle 12 is attached to the main shaft of the sewing machine. (not shown).

A feed cam 13 constituting a feed drive means is fixed to the sewing machine frame 10 to a camshaft 1 that rotates in conjunction with the main shaft of the sewing machine. Grooved cam portions 1 are provided on the upper and lower surfaces of the feed cam 13.
4 and 15 are formed, and those cam parts 1
4 and 15 have engaging elements 18 and 1 formed with a vertical cam lever 16 and a lateral cam lever 17, respectively.
9 is slidably fitted.

Those vertical and horizontal feed cam levers 16, 17
is connected to the feed base 20 via appropriate links, and when the feed cam 13 rotates once,
The feed table 20 is adapted to be given a feed motion corresponding to one sewing cycle consisting of the first half and the second half cycles.

The sewing machine frame 1 is mounted on the feed table 20.
Feeder guide plate 21 attached to the bed part of 0
and a feed plate 2 capable of sliding on the throat plate 22.
3 is fixed, and the button holder holder 2
4 is rotatably supported around a shaft 26 via a support stand 25.

A button clamp 29 is fixed to the button clamp holder 24 at its free end, and has a pair of button clamp arms 29a and 29b that clamp the button 27 and cooperate with the feed plate 23 to press and hold the work cloth 28. The button holder 24 and the button holder 2
9 constitutes a presser foot.

Further, a recess 30 is provided on the upper surface of the button clamp holder 24, and one end of a presser foot pressure adjusting member 31 consisting of a screw shaft is joined to the recess 30. The other end of the presser foot pressure adjusting member 31 is movably inserted into and supported by a support hole 33 of a lever holder 32 fixed to the sewing machine frame 10, and the workpiece cloth 28 is disposed between the lever holder 32 and the lever holder 32. A presser foot spring 34, which constitutes a biasing means for applying pressure to the presser foot, is wound around the presser foot spring 34.

Furthermore, a vertical portion of an engaging member 36, which is formed by bending a rod with a circular cross section into an L-shape, is fixed to the button holder holder 24, and flat surfaces 36a and 36b are cut out in the horizontal portion of the engaging member 36. .

A button catch lever 37 constituting a presser foot lifting member is rotatably supported on the lever holder 32 about a shaft 38 . A known presser foot lifting mechanism (not shown) is connected to the right end of the button catch lifting lever 37 in FIG. 39 can be moved upward.

Furthermore, the button clamp holder 24 supported by the feed base 20 is given a vertical movement in the left and right direction in FIG. Along with the feeding movement, the engaging member 36 is moved relative to the button catch lever 37. When the sewing operation of the first stitch row 40 formed in the first half of the sewing cycle and on the right side in FIG. 4 is stopped, even if the presser foot lifting mechanism is activated, The engagement member 36
The flat surface 36a of the button catch lever 37 cannot be engaged with the engaging end 39 of the button catch lever 37, and is formed in the latter half of the sewing cycle and is located on the left side in FIG. When the sewing operation of the second stitch row 41 formed at the position is stopped, the flat surface 36a of the engaging member 36 and the engaging end portion 39 engage with each other as the presser foot lifting mechanism operates. I'm starting to get it.

On the other hand, a fixed blade 42 is fixed to the back surface of the throat plate 22, and a known thread cutting mechanism includes the fixed blade 42 and a movable blade 43 that cooperates with the fixed blade 42 to cut the sewing thread end. It is provided so as to be able to operate in response to the stoppage of the sewing operation in the first and second half cycles.

The operation of the button sewing machine constructed as described above will be explained.

When the button sewing machine is started, all mechanisms such as the feed cam 13 are operated, and first, in the first half cycle, the first stitch row 40 located on the right side in FIGS. 4 and 5 is formed. . When this first half cycle is completed, the sewing operation is stopped and the thread trimming mechanism and presser foot lifting mechanism are activated, but the engaging member 36 provided on the button clamp holder 24 is in the position shown in A in FIG. Because of this, the button grip lever 3
Even if the engaging end portion 39 of 7 is moved upward, the engaging member 36 and the engaging end portion 39 do not engage with each other, and the button grip 2
Only thread cutting is performed while the work cloth is held by the feed plate 9 and the feed plate 23.

Thereafter, in order to form the second stitch row 41 located on the left side in FIGS. 4 and 5 in the latter half of the cycle, the feed cam 13 is supported by the feed base 20 by the action of the cam portion 14 of the feed cam 13. feed plate 2
3. The button grip holder 24 and the like are moved to the right side in FIG. Then, the stitch forming means is driven again, and the second stitch row 41 is formed. When the second half of the cycle is completed and the sewing operation is stopped, the thread trimming mechanism and presser foot lifting mechanism operate again. At this time, since the engaging member 36 is at the position B in FIG. 2, thread cutting is performed and the button clamp 2
9 is also moved upward and the presser foot is lifted. Then, by the action of the cam portion 14, the feed plate 23, the button clamp holder 24, etc. are returned to the left position for forming the first stitch row, and the feed cam 13 is stopped. One sewing cycle is completed.

As described in detail above, in this embodiment, the engagement member 3 is moved by the drive of the feed cam 13.
6 is different when the sewing operation of the first stitch row 40 is stopped and when the sewing operation of the second stitch row 41 is stopped. When the operation is stopped, the button clamp lifting lever 37 and the engaging member 36 do not engage with each other to prevent the presser foot from being lifted, and when the sewing operation of the second stitch row 41 is stopped, the button clamp lifting lever 37 is prevented from engaging with the engaging member 36.
Since the presser foot is raised by engaging the engaging member 36, a button sewing machine that can sew a four-hole button without using a crossing thread can be provided with a slight improvement. be.

In this embodiment, the present invention is applied to a button sewing machine, but it can also be applied to a cycle sewing machine for sewing labels, which forms the stitches shown in FIG.

Furthermore, although the engaging member 36 in this embodiment is moved by the feed cam 13, it goes without saying that it may be moved using a separate driving means such as a solenoid or an air cylinder. .

Effects The present invention is a cycle sewing machine in which thread cutting and presser foot lifting are performed at the same time, and which forms two stitch rows consisting of the first half and the second half of the cycle. Since the workpiece presser foot is not lifted up, beautiful seams can be formed without shifting the workpiece cloth.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main part of a button sewing machine for explaining one embodiment of the present invention, and FIG.
FIG. 3 is a partially enlarged front view showing the positional relationship between the button gripping lever 37 and the button gripping lever 37; FIG. 4 is a partially enlarged left side view of the same;
FIG. 5 is a diagram showing the stitching operation, and FIG. 6 is a diagram showing the state of stitches in another embodiment. In addition, 12 is a needle, 13 is a feed cam constituting the feed drive means, 14 is a cam portion constituting the moving means, 2 is a needle, 3 is a feed cam, and 4 is a feed cam.
Reference numeral 8 denotes a workpiece, 24 and 29 denote a button clamp holder and a button clamp constituting the presser foot, 34 denotes a presser foot spring constituting the biasing means, 36 denotes an engagement member, 37 denotes a button clamp lifting lever constituting the presser foot lifting member, 40
indicates a first stitch row, 41 indicates a second stitch row, 42 indicates a fixed blade, and 43 indicates a movable blade.

Claims (1)

[Claims for Utility Model Registration] 1. A stitch forming means including a needle 12 that reciprocates up and down, and a work cloth 28 that can be moved on a work cloth support surface across the vertical movement path of the needle, and presser feet 24, 29 supported on the sewing machine frame so as to be movable up and down with respect to the work cloth support surface; and operably connected to the presser feet 24, 29;
A feeding motion for forming the first stitch row 40 is applied to the presser feet 24 and 29 in the first half cycle, and at least the needle drop point of the last needle of the first stitch row 40 is applied in the second half cycle. a feed drive means 13 and the like for applying a feed movement for forming a second stitch row 41 having a needle drop point of the final needle located at a position distant from the presser foot 24, 29; A biasing means 34 for applying presser foot pressure toward the cloth supporting surface; and an engaging portion 3 provided on the presser foot 24, 29.
6, a presser foot lifting member 37 that is operated at a fixed position in response to a stop operation of the sewing machine at the end of each half cycle; thread cutting mechanisms 42 and 43 for cutting the sewing thread at the end of each half cycle; and at the end of the second half cycle, the presser foot lifting member 37 and the engaging portion 36 engage, thereby causing the urging means 34 to act. The presser foot 24, 29
2. A cycle sewing machine characterized by comprising moving means 13, 14, etc., for moving the engaging portion 36 within the movement locus of the presser foot lifting member 37 so as to raise the presser foot. 2. The cycle sewing machine according to claim 1, wherein the moving means 13, 14, etc. are interlocked with the feed drive means 13, etc.